U.S. patent number 8,038,349 [Application Number 11/886,575] was granted by the patent office on 2011-10-18 for flexible package and method of producing the same.
This patent grant is currently assigned to Regath HB. Invention is credited to Thomas Andersson, Carl-Olof Norlin.
United States Patent |
8,038,349 |
Andersson , et al. |
October 18, 2011 |
Flexible package and method of producing the same
Abstract
The invention relates to a flexible package (1) formed by a
wrapped material having a first longitudinal joint (4) comprising
two longitudinal edge portions of the wrapped material. The package
(1) also has a first and a second transverse joint (5, 6), each
comprising a transversal edge portion of the wrapped material. The
package (1) comprises a pocket defined by said wrapped material, an
openable flap (11) defined by an indication (10) and a label (12)
fixed to the openable flap (11) and provided with a tab (14) for
opening the package (1) along the indication (10). The package (1)
is characterised by a first and a second longitudinal stiffener (3)
being formed by said wrapped material and that said label (12) is
adhesively fixed to at least one of said first and second
longitudinal stiffeners (3). The invention also relates to a method
of producing such package.
Inventors: |
Andersson; Thomas (Morarp,
SE), Norlin; Carl-Olof (Strovelstorp, SE) |
Assignee: |
Regath HB (Helsingborg,
SE)
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Family
ID: |
34935213 |
Appl.
No.: |
11/886,575 |
Filed: |
April 11, 2006 |
PCT
Filed: |
April 11, 2006 |
PCT No.: |
PCT/EP2006/003326 |
371(c)(1),(2),(4) Date: |
September 18, 2007 |
PCT
Pub. No.: |
WO2006/108614 |
PCT
Pub. Date: |
October 19, 2006 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20090028472 A1 |
Jan 29, 2009 |
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Foreign Application Priority Data
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Apr 15, 2005 [EP] |
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05008246 |
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Current U.S.
Class: |
383/205; 383/207;
383/107; 53/133.1; 383/203; 53/133.7; 53/412; 383/119; 383/66;
53/133.6 |
Current CPC
Class: |
B65D
75/44 (20130101); B65D 75/5838 (20130101); B65D
2575/586 (20130101) |
Current International
Class: |
B65D
33/00 (20060101); B65D 33/16 (20060101); B65D
33/02 (20060101); B65B 61/18 (20060101); B65B
61/20 (20060101) |
Field of
Search: |
;383/66,203,205,207,208,119,107 ;229/87.05
;53/412,451,133.4,133.8,551,133.6,133.7 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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08207964 |
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Aug 1996 |
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JP |
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WO-86/06350 |
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Nov 1986 |
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WO |
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Primary Examiner: Pascua; Jes F
Attorney, Agent or Firm: Birch, Stewart, Kolasch &
Birch, LLP
Claims
The invention claimed is:
1. A flexible package formed by a wrapped material having a first
longitudinal joint comprising two longitudinal edge portions of the
wrapped material and a first and a second transverse joint, each
comprising a transversal edge portion of the wrapped material,
comprising: a top wall and a pair of side walls extending
downwardly from the top wall, a pocket defined by said wrapped
material, an openable flap defined by an indication, a label fixed
to the openable flap and provided with a tab for opening the
package along the indication, and a first and a second longitudinal
stiffener being formed by said wrapped material, the stiffeners
extending outwardly from the side walls, wherein said label is
adhesively fixed to at least one of said first and second
longitudinal stiffeners.
2. The flexible package according to claim 1, wherein said
stiffeners extend over the full length of the material.
3. The flexible package according to claim 1, wherein one of said
stiffeners comprise said longitudinal joint.
4. The flexible package according to claim 1, wherein said first
and second longitudinal stiffeners and said first and second
transverse joints define a front surface area having an area which
is less than half of the total surface area of the pocket, and that
said indication and label are located on said front surface.
5. The flexible package according to claim 1, wherein said label is
adhesively fixed to the wrapped material over the full extension of
the indication for the purpose of resealably sealing the package
after opening.
6. The flexible package according to claim 1, wherein said
indication extends between said first and second longitudinal
Stiffeners.
7. The flexible package according to claim 6, wherein said
indication extends from the inner borderline of the first
longitudinal stiffener to the inner borderline of the second
longitudinal stiffener.
8. The flexible package according to claim 1, wherein said package
comprises in addition at least a third longitudinal stiffener, and
that each longitudinal stiffeners viewed in a transverse cross
section, define an inner corner of said package.
9. The flexible package according to claim 1, wherein endpoints of
said indication are arranged within a distance from the inner
borderlines of any of said longitudinal stiffeners, longitudinal
joints or transversal joints.
10. The flexible package according to claim 1, wherein endpoints of
said indication are arranged within a distance of 0-5 mm from the
inner borderlines of any of said longitudinal stiffeners,
longitudinal joint or transversal joints.
11. The flexible package according to claim 1, wherein the first
and longitudinal stiffeners comprise two adjoined wall portions of
said wrapped material.
12. The flexible package according to claim 1, wherein the
longitudinal stiffeners form a generally flat surface extending
outside inner borderlines of said stiffeners, wherein the label is
attached to this surface covering the full extent of the indication
and any tearing lines that are formed during opening of the
flexible package.
13. A method for producing a flexible package of a wrapped
material, comprising: providing an indication in the material,
which indication defines an openable flap, wrapping the material
about a longitudinal axis, such that two longitudinal edge portions
of the material makes contact, joining the two longitudinal edge
portions in a longitudinal joint, delimiting a pocket by forming a
first and a second transverse joint top form a top wall and a pair
of side walls extending downwardly form the top wall, providing a
first and a second longitudinal stiffeners being formed by said
material, the longitudinal stiffeners extending outwardly from the
side walls, and adhesively positioning a label on the openable flap
and on at least one of said first and second longitudinal
stiffeners, which label is provided with a tab for opening the
package along the indication.
14. The method according to claim 13, wherein said stiffeners are
provided over the full length of the material.
15. The method according to claim 13, wherein said longitudinal
joint constitutes one of said longitudinal stiffeners.
16. The method according to claim 13, wherein said first and second
longitudinal stiffeners and said first and second transverse joints
are provided such that they define a front surface area having an
area which is less than half of the total surface area of the
pocket, and that said indication and label are located on said
front surface.
17. The method according to claim 13, wherein said label is
positioned over the indication.
18. The method according to claim 13, wherein said indication is
provided such that it extends between said first and second
longitudinal stiffeners.
19. The method according to claim 13, wherein said indication is
provided such that it extends from the inner borderline of the
first longitudinal stiffener to the inner borderline of the second
longitudinal stiffener.
20. The method according to claim 13, wherein at least a third
longitudinal stiffener is provided by adjoining two wall portions
of said sheet material, whereby each stiffener, when viewed in a
transverse cross section, defines an inner corner of said
package.
21. The method according to claim 13, wherein endpoints of said
indication are arranged within a distance from the inner
borderlines of any of said longitudinal stiffeners, longitudinal
joint or transversal joints, which distance can be 0-5 mm.
22. The method according to claim 13, wherein said first and second
longitudinal stiffeners are formed by adjoining two wall portions
of said sheet material.
Description
FIELD OF THE INVENTION
The present invention relates to a flexible package formed by a
wrapped material having a first longitudinal joint comprising two
longitudinal edge portions of the wrapped material and a first and
a second transverse joint, each comprising a transversal edge
portion of the wrapped material. The package comprises a pocket
defined by said wrapped material, an openable flap defined by an
indication, and a label fixed to the openable flap and provided
with a tab for opening the package along the indication. The
invention also relates to a method of producing such flexible
package.
BACKGROUND ART
Flexible packages of the type `flow pack` are well known. In their
simplest form they are formed by wrapping a continuous web of
material about its longitudinal axis and then joining the
longitudinal edges of the web so that they form a joint extending
along the longitudinal axis of the web. The wrapping is made around
the intended contents. The thus formed tube is partitioned off to
form a closed pocket by means of upper and lower transverse joints.
A package of this type can also be made by wrapping the material
into a tube which is partitioned off to form a pocket by means of a
first transverse joint forming the bottom thereof. The pocket is
filled with its contents and closed by means of a second transverse
joint forming the top thereof.
One way of opening this type of package is by tearing off a corner
or tearing apart one of the trans-verse joints. Such opening is
difficult to control, since the material in the worse case scenario
is torn in an uncontrolled manner, fully destroying the package.
Also, it does not allow for resealing.
Resealable packages of this type using a flap and seal are known. A
typical flap, indication and label are disclosed in U.S. Pat. No.
4,874,096. The package is a `flow-pack` having an arcuate
indication which defines the flap. The flap is covered by a
resealable label. Further examples of documents describing this
type of packages are WO86/06350 and EP 0 193 130.
The typical solution in these prior art resealable packages is to
provide a flap in the package wall whose delimitation corresponds
to the desired opening. The delimitation consists of an indication,
which may be an area of locally thinner material, a perforation or
a through slit. A self-adhesive label covers the flap and the
indication. The indication, combined with the self-adhesive label,
gives the package a controlled opening geometry and an opening that
can be easily resealed. This solution however requires the
indication to be smaller than the width or length of the package,
depending on the orientation of the flap, since the label must
cover, not only the indication, but also an area surrounding said
indication. This involves problems to be explained below.
In the filled condition the walls of the package will conform to,
and more or less follow the geometry of the object. Accordingly,
also the indication and the label will conform to the geometry,
making the width of the package and the opening seen in a
horizontal plane more narrow. Supposing the object is a rectangular
parallelepiped, there is a risk when pulling out the object through
the opening, that the object will get stuck inside the package
since the opening is too small. Even if it is possible to pull out
the object, there is a risk that the corners of the object will
tear the material and destroy the package. There is also a risk of
damaging the object. The latter is especially the case if the
object is easily damaged or rigid, e.g. slices of cheese or a
printed circuit card.
One way to solve this is to increase the size of the package
compensating for the conforming to the contour of the object.
However, a larger package means superfluous use of material and a
flapping, generally less aesthetic look.
It is admittedly possible for the indication to cover the full, or
almost full width or length of the package. However, in that case
the label must be applied and folded over from one wall to the
other. This is especially the case if the label should cover the
full extent of the indication, including any tearing lines that are
formed during opening. Such label is hard to apply in high-speed
production. There is a risk that the conformation of the side walls
to the geometry of the object creates tensions damaging the
indication, and it is hard to reseal the package. Further, if the
indication is arranged in the longitudinal direction, there is no
natural stopping means when tearing the material, unless the
longitudinal joint, which generally is applied on the back wall, is
repositioned in accordance with the desired shape and orientation
of the flap.
Based on the above discussed problems, packages of the `flow pack`
type are generally not used for easily damaged or rigid objects
where access to the full width or length is required through the
opening. Instead different types of flexible or rigid deep drawn
packages are used having a lid-like closure. This type of packages
allow an opening to be formed across the full width/length or area
of the mouth of the deep drawn package. This is however a type of
package being different from the `flow pack` type.
OBJECTS OF THE PRESENT INVENTION
One object of the present invention is to provide a flexible
package of the `flow pack` type allowing for a opening across the
whole width or length of the package, no matter if the package is
filled or not.
A second object of the present invention is to provide such
resealable package.
A third object is the provision of a flexible package of the `flow
pack` type having an essential three-dimensional volume even in its
unfilled condition.
Yet another object is the provision of a flexible package that can
be produced in existing machinery, requiring no or minor
rebuilding.
Still another object is provision of a method of producing such
flexible package.
SUMMARY OF THE INVENTION
To achieve at least one of the above objects, and also other
objects that will appear from the following description, an
apparatus and a method having the features defined in claims 1 and
18 are provided according to the present invention.
A number of geometrical terms will be used to describe the
invention. The terms upper, lower, top and bottom do all relate to
a rectangular package viewed in a vertical, up-right standing
position. The term longitudinal relates to the vertical axis of
such standing package, but also the feeding direction of a
continuous web of material. The term transverse relates to the
horizontal axis of a standing package, but also to the direction
perpendicular to said feeding direction. Said upright standing
package has a back wall and a front wall. The latter, unless
nothing else is given, is provided with a label and an indication
for opening and resealing the package. By width is meant the
measure in the transversal direction of the up-right standing
package, or a rectangular parallelepiped object contained in said
package.
The term borderline includes a borderline formed by a weld, but
also a borderline that can be formed by a fold.
More specifically, the invention relates to a flexible package
formed by a wrapped material having a first longitudinal joint
comprising two longitudinal edge portions of the wrapped material
and a first and a second transverse joint, each comprising a
transversal edge portion of the wrapped material, comprising a
pocket defined by said wrapped material, an openable flap defined
by an indication, and a label fixed to the openable flap and
provided with a tab for opening the package along the indication.
The flexible package is characterised by a first and a second
longitudinal stiffener being formed by said wrapped material, and
that said label is adhesively fixed to at least one of said first
and second longitudinal stiffeners.
A flexible package of this type is a `flow pack` having an interior
volume which is defined by the inner envelope surface of the
wrapped material. Also it has a front wall and a back wall, each
being defined by the inner borderlines of the transversal joints,
the longitudinal joint and the longitudinal stiffeners. The package
allows for an indication to be arbitrary arranged between or within
the borderlines of said joints and stiffeners, preferably on the
front wall.
By the stiffeners, the package receives a generally
three-dimensional volume even in its unfilled condition. The volume
can during production be adapted to the volume and geometry of the
contents. More precisely, the volume is determined by the distance
between inner borderlines of the stiffeners on the front wall and
the back wall of the package, respectively. When producing the
package said distance on the front wall can be adapted to the width
of the object to be contained in the package. Also, the distance on
the back wall can be adapted to correspond to the width plus twice
the thickness of the object to be contained in the package. By
arranging, by way of example, an indication extending between the
inner borderlines of said stiffeners, the package will in an opened
condition receive an opening extending across the full width of the
package and also the full width of the object. Also an opening
corresponding to the size of the front wall is possible. Unlike a
prior art `flowpack`, full control of the size and position of the
opening is achieved.
The stiffeners form a generally flat surface extending outside the
inner borderlines.
By the label being adhesively fixed to at least one of the first
and second longitudinal stiffeners an opening is allowed to be
formed across the full width or length of the package. Also, it
allows an opening to be formed across the full front wall area.
Further, it allows for the opening to be easily resealed since the
stiffeners form an attachment surface for the label being
positioned outside the opening, although the latter extends across
the full front wall surface.
The label can be attached to this surface to cover the full extent
of the indication and any tearing lines that are formed during
opening. Thereby, the flap together with the label form a lid by
which the package, although being provided with an opening across
the whole front wall surface, can be resealed.
Further, the inner borderlines of the stiffeners will act as
guiding means which will guide the tearing of the material towards
one of the two transversal joints or the longitudinal joint,
depending on the actual orientation of the indication. The joint(s)
will act as natural stopping means for further tearing. Thus, the
flap that results when opening the package will be defined by the
indication, the tearing lines along the inner borderlines of the
stiffeners and the inner borderline of the joint being arranged in
the pulling direction.
Supposing the package is made to be opened by pulling the flap
towards one of the transversal joints, a package of this type
allows an opening to be formed not only across the full width of
the package, but also across the full transversal cross section of
the package. Thereby an object contained in the package can be
pulled out in the longitudinal direction without being stopped by
any wall portions. This is made possible by turning the flap more
than 180 degrees around e.g. the transversal joint.
The package is easily resealable by simply pulling back the flap to
its original position covering the opening and pressing it against
the package.
Further, the front wall together with the stiffeners provide a
generally flat surface which is excellent for application of a
print or label.
The stiffeners can in their simplest form be formed by folding and
welding the material. Such operation can be made outside the
machinery. Thus, there is no need for any new machinery, but
existing machinery can be used with no or minor re-building.
The stiffeners can extend over the full length of the material.
This allows for a continuous production of not only packages as
such but also prefabrication of a continuous web of material
provided with stiffeners that can be rewound as intermediate goods.
It is possible for one of said stiffeners to comprise said
longitudinal joint. In the context of this invention, a joint is
formed by joining at least two edge portions of the material to
provide a closed package. A stiffener primarily provides a surface
to which the label can be attached. Further, a stiffener provides
rigidity and volume to the package.
In one embodiment said first and second longitudinal stiffeners and
said first and second transverse joints define a front surface area
having an area which is less than half of the total surface area of
the pocket. Thereby, the package will expand a three-dimensional
volume even in its unfilled condition. Also, it is possible to
adapt the front surface area, i.e. the front wall, to the front
surface area of the object to be contained in the package, and
especially to its length or width. In the optimal package for a
parallelepiped object, the circumference of the wrapped material
seen in a transverse cross section of the package corresponds to
the circumference of said object. Further, in said optimal package
the distance between the borderlines of the two stiffeners on the
front wall corresponds to the width or length of said object
depending on the intended orientation of the object inside the
package.
The label can be adhesively fixed to the wrapped material over the
full extension of the indication for the purpose of resealably
sealing the package after opening. It is to be understood that the
possibility of resealing is depending on the type of adhesive, i.e.
if self-adhesive or not.
The indication can have any suitable extension, preferably between
said first and second stiffeners, between said first and second
transverse joints, or between one of said first and second
longitudinal stiffeners and one of said first and second transverse
joints. In its simplest form, the extension is straight or arcuate.
The indication must not extend the full final extent of the desired
opening. The length can be the combined length of the indication
and the tearing lines formed during opening.
Also, the indication can extend from the inner borderline of the
first longitudinal stiffener to the inner borderline of the second
longitudinal stiffener, from the inner borderline of the first
transverse joint to the inner borderline of the second transverse
joint, or from the inner borderlines of one of said first and
second longitudinal stiffeners to the inner borderlines of one of
said first and second transverse joints. By letting the indication
extend from one borderline to another, the material during tearing
when opening the package is allowed to follow and be guided along
the borderlines. This results in a well controlled opening. It also
results in an opening covering the full width of the package
allowing objects to be pulled out from the opened package in the
vertical or longitudinal direction without interference with any
wall portions. Thus, an opening covering the full front wall area
is possible.
Further, depending on the extension selected, the label can further
be adhesively fixed to at least one of said first and second
transverse joints.
It is possible for the package to comprise at least a third
longitudinal stiffener, and that each longitudinal stiffener,
viewed in a transverse cross section, define an inner corner of
said package. This allows the inventive package to have a prismatic
cross section when viewed in the transverse direction.
In one embodiment the endpoints of said indication are arranged
within a distance from the inner borderlines of any of said
longitudinal stiffeners, longitudinal joint or transversal joints.
The distance can be 0-5 mm, preferably 1-4 mm and most preferred
2-3 mm. During opening of the package by pulling the label, the
package will initially open along the indication. If further
pulled, the material will be torn along a tearing line which
strives towards and follows the inner borderlines. This provides an
opening across the full width or length of the package although
said initial distance. The longitudinal stiffeners, longitudinal
joint or transversal joints will act as natural stopping means for
further tearing. Further, the distance allows for slight
misalignment of the material in the machine during production of
packages.
In one embodiment the longitudinal stiffeners comprise two adjoined
wall portions of said wrapped material. This can by way of example
be made by folding the material or by joining two or more webs or
sheets of material along their longitudinal edges.
In another embodiment the longitudinal stiffeners form a generally
flat surface extending outside inner borderlines of said
stiffeners, wherein the label is attached to this surface covering
the full extent of the indication and any tearing lines that are
formed during opening of the flexible package.
According to another aspect, the invention relates to a method for
producing a flexible package of a wrapped material comprising the
steps of providing an indication in the material, which indication
defines an openable flap, wrapping the material about a
longitudinal axis, such that two longitudinal edge portions of the
material makes contact, joining the two longitudinal edge portions
in a longitudinal joint and delimiting a pocket by forming a first
and a second transverse joint. The method is characterized by the
steps of providing a first and a second longitudinal stiffener
being formed by said material and adhesively positioning a label on
the openable flap and on at least one of said first and second
longitudinal stiffeners, which label is provided with a tab for
opening the package along the indication.
The method, generally claiming the same features as those relating
to the flexible package, benefits from the same advantages as those
already mentioned above. This also applies to the dependent method
claims.
Especially, the wrapped material can be pre-prepared with said
longitudinal stiffeners, or the stiffeners can be provided when
entering the machinery or during processing in the machinery.
Further, the material can be provided in the form of a continuous
web or in the form of individual sheets. Thus, there is no need for
any new machinery, but existing machinery can be used with no or
minor re-building. Also, the user can, within the scope of the
claimed method, use a material being composed of one or several
materials, structures, thicknesses, colours etc. This allows, by
way of example, production of a package having a front wall of a
thin transparent plastic foil and a back wall of an embossed
plastic foil being coloured throughout.
DESCRIPTION OF DRAWINGS
The invention will now be described in more detail by way of
example and with reference to the accompanying drawings.
FIG. 1 illustrates a resealable `flow pack` according to prior art
containing a rectangular parallelepiped object. The package is
unopened.
FIG. 2 illustrates the package according to FIG. 1 in an opened
condition.
FIG. 3 illustrates a first embodiment of the package according to
the invention. The package is illustrated in an unopened condition
containing a rectangular parallelepiped object.
FIG. 4 discloses a transversal cross-section of the package of FIG.
3.
FIG. 5a discloses the package of FIG. 3 in an opened condition.
FIG. 5b highly schematically discloses a front plan view of the
package illustrating the indication and tearing lines striving
towards the inner borderlines of the stiffeners.
FIGS. 6a-6c discloses schematically, three embodiments of a
continuous web of material before wrapping.
FIGS. 7a-7c schematically discloses three embodiments of a
transversal joint in cross section.
FIG. 8 is a flow chart of the method used to produce the
package.
DESCRIPTION OF PREFERRED EMBODIMENTS
For improved understanding of the invention, reference is made to
FIG. 1, disclosing a typical prior art resealable package 100 in an
unopened condition. The disclosed package 100 is generally known as
a `flow pack`.
The package 100 is made (not shown) by wrapping a continuous web of
material about its longitudinal axis and joining the longitudinal
edges of the material so that they form a joint 101 extending along
the longitudinal axis of the web material. The web of material thus
joined is partitioned off to form a pocket by means of a lower
transverse joint 102 forming the bottom thereof. The pocket is
filled and closed by means of an upper transverse joint 103 forming
the top thereof, before the finished package 100 is separated.
The package 100 has an openable flap 104 defined by an indication
105 being punched in the material.
The indication 105 is covered by a label 106 which on its surface
facing the package is provided with an adhesive. The label 106 is
resealably adhered to the package 106 so that the package can be
opened and resealed repeatedly.
The indication 105 in the prior art package 100 of FIG. 1 has an
extension within the peripheral borderlines 107 of the package 100,
when the package is seen in a flat, unfilled condition (not
disclosed). Further, the borderlines 108 of the label 106 covering
the indication 105 are arranged within the same peripheral
borderlines 107 of the package 100. As is schematically illustrated
in FIG. 1, the package 100 contains a rectangular parallelepiped
object 109. The front and back walls of the package 100, and thus
the indication 105 and the label 106, are roughly conforming to the
geometry of the object 109, i.e. the object expands the package to
a three-dimensional geometry. Without contents a prior art `flow
pack` is more or less two-dimensional.
With reference to FIG. 2 the prior art package 100 of FIG. 1 is
schematically illustrated in an opened state. For enhanced
understanding, the flap and label are removed, whereby only the
opening 110 defined by the indication 105 is shown.
When lifting and pulling the flap (not shown) for opening the
package along the indication, the material in the indication 105
and the front wall is torn in the pulling direction, i.e. in the
illustrated package towards the upper transverse joint 103. The
transverse joint acts as a stopping means preventing further
tearing.
In FIG. 2 it is shown that conformation of the walls to the
geometry of the object 109 makes the opening 110 smaller than the
width of the object 109. When pulling out the object 109 through
the opening 110, its corners will consequently be stopped by the
front wall 111. If the object has sharp corners or edges, they
might damage the front wall or affect the possibility to resealably
close the package. In the worse case scenario, the object might be
damaged.
Now referring to FIG. 3, a first embodiment of the package 1
according to the invention is disclosed.
The package has two opposing side walls, i.e. a front wall 2 and a
back wall (not shown), being formed by wrapping a continuous web of
material along its longitudinal axis. Before, or during this
wrapping, two longitudinal stiffeners 3 are formed. In their
simplest form, the stiffeners are formed by folding and subsequent
welding. The material and the forming of the stiffeners 3 will be
discussed in detail below.
Further, the longitudinal edges of the wrapped material are joined
by welding so that they form a longitudinal joint 4 extending along
the longitudinal axis of the web. The tube thus formed is
partitioned off to form a pocket by means of a first lower
transverse joint 5 forming a bottom of the package 1 and an second
upper transverse joint 6 forming a top of the package. Finally, the
finished package is separated.
The longitudinal joint 4 as well as the transversal joints 5, 6 are
preferably formed by welding. Also, adhesive can be used. The
longitudinal joint 4 is preferably arranged on the back wall of the
package.
Said wrapping can be made around the intended contents. The
contents can also be filled in the pocket being formed by wrapping
before the second transverse joint is formed. The first option is
suitable for rigid objects, whereas the second option is suitable
for unstable or low-viscous contents.
The longitudinal stiffeners 3 are positioned asymmetrically around
the envelope surface of the package when seen in the transverse
direction, see FIG. 4. By way of example the distance between the
inner borderlines 7 of the stiffeners 3 on the front wall 2 is
smaller than the distance between the inner borderlines 7 of the
stiffeners 3 on the back wall 8. This difference makes the package
expand a volume even in its unfilled condition.
It is to be understood that the distances between the inner
borderlines 7 on the front wall 2 and back wall 8 preferably are
adapted to the geometry of the object 9 intended for the package.
By way of example, if the object 9 has a rectangular, transversal
cross section, having a width A and a thickness B, see FIG. 4, the
distance between the inner borderlines 7 on the front wall 2
substantially corresponds to the measure A, whereas the distance
between the inner borderlines 7 on the back wall 8 substantially
corresponds to the measure A+2B. This will provide a package 1
having a substantially flat front wall 2. Also, by this design the
stiffeners 3 tend to be forced by the object into a generally
horizontal direction extending in the same plane as the front wall
2.
In FIG. 4 the longitudinal stiffeners are arranged in the same
plane as the front surface. However, the longitudinal stiffeners
can also be arranged in a plane being different from the plane of
the front surface.
Now referring to FIG. 3, the package 1 is openable and resealable
by an indication 10 defining a flap 11 and a label 12 covering said
indication 10. The arcuate indication 10 is formed on the front
wall 2. The indication 10 extends between the inner borderlines 7
of the stiffeners 3.
The label 12 is applied on the front wall 2 covering the extent of
the indication 10, but also an area surrounding said indication.
More precisely, the label 12 is attached to the front wall 2
covering the extent of the indication 10, but also a portion 13 of
the stiffeners 3 adjacent the indication. The portion 13 of the
stiffeners 3 covered by the label 12, in the following to be
referred to as bonding surface 13, preferably extends in the
longitudinal direction corresponding to not only the longitudinal
extent of the indication 10, but also the longitudinal extent of
the tearing line (not shown) along the borderline of the stiffener.
The tearing line is formed when opening the package and will be
described in detail below with reference to FIG. 5. Thereby, after
opening, the package can be fully re-sealed when closing the
package by pressing the self-adhesive label against the bonding
surfaces 13 on the stiffeners 3 and the front wall 2. The bonding
surfaces 13 and the stiffeners 3 preferably have a width that is
enough to provide for a satisfying resealing. The width of the
bonding surfaces 13 may correspond to or be smaller than the width
of the stiffeners 3.
In case of a resealable package 1, the adhesive should be
self-adhesive.
The label 12 further has a gripping tab 14 provided along one edge.
The gripping tab 14 is preferably adhesive free or adhesively
killed.
Now turning to FIG. 5a, the package 1 according to FIG. 3 is
illustrated in an opened condition. The package 1 is opened by
gripping the tab 14 and pulling the flap 11, whereby the package 1
is opened along the indication 10. During opening the material is
torn in the pulling direction towards the inner borderline 15 of
the upper transverse joint 6, which acts as a stopping means
preventing further tearing. Since the endpoints of the indication
are arranged close to the inner borderlines 7 of the stiffeners 3
the material will be torn along these borderlines 7 which act as
guiding means. Thus, depending on the extent of the indication 10,
the material may not only be torn along the indication 10, but also
along tearing lines 16. The flap 11 is thus defined either by the
indication 10 alone or by a combination of the indication 10 and
the resulting tearing lines 16. The thus opened package 1 will have
a opening 17 covering the full width of the package 1.
The package 1 is easily resealable, by simply pulling back the flap
11 and pressing it against the bonding surfaces 13 and the front
wall 2. The resealing effect is achieved by the label being
self-adhesive.
Although the illustrated package 1 has en indication 10 extending
between the inner borderlines 7 of the longitudinal stiffeners 3 on
the front wall 2 of the package 1, it is to be understood that the
indication 10 also can be arranged extending between the inner
borderlines 15 of the transverse joints 5, 6, between the inner
borderlines of a first or a second transverse stiffener (not shown)
and a first and a second transverse joint 5, 6, respectively. Thus,
the indication 10 can have an arbitrary extent within or between
the inner borderlines of said longitudinal or transversal
stiffeners and said transverse joints. This applies to any wall of
the package, i.e. the front wall as well as the back wall or any
wall in a package having a prismatic shaped transversal cross
section.
With reference to FIG. 5b, the endpoints 18 of the indication 10
are preferably in an unopened package arranged within a distance
from the inner borderlines 7 of any of said longitudinal
stiffeners, longitudinal joint or transversal joints. The distance
can by way of example be 0-5 mm, preferably 1-4 mm and most
preferred 2-3 mm
As has been defined above, the term borderline includes a weld line
but also a line that can be formed by a fold. More precisely, a
stiffener is preferably formed by folding and subsequently welding
the surface. Depending on the tolerance or the design of the weld a
small gap C, see FIG. 4 can be formed in the overlapping area along
the extent of the stiffener. Said distance 0-5 mm should include
such gap.
During opening, the tearing line 16 will strive towards and follow
the inner borderlines 7, whereby an opening 17 will be formed
across the full width or length of the package 1.
The material of the package 1 can be any type of flexible material
suitable for the intended purpose and use of the package. The
material can by way of example be plastics, paper or metal, or
laminates comprising layers thereof. Also, one and the same package
can have walls or wall portions each being made of different
materials. The material can have a molecular orientation providing
for the material to be torn in a specific direction.
As is mentioned above, the package 1 is made of a wrapped material.
The material can be in the form of a sheet, or more preferred in
the form of a continuous web. The continuous web can be formed as a
single web, or being a web that is made of one or several
longitudinally joined webs. Each web can have a desired quality,
thickness, structure, material or colour.
Depending on the design of the continuous web, the stiffeners can
be made in a number of ways, of which three embodiments are
schematically illustrated in FIGS. 6a-6c.
Referring to FIG. 6a a first embodiment is disclosed wherein
longitudinal stiffeners 3 are formed in a single continuous web 19
by forming longitudinal folds 20. In the folds 20 the adjoining
inner surfaces are welded together. The stiffeners 3 are formed
before wrapping.
Referring to FIG. 6b a second embodiment is disclosed wherein
stiffeners 3 are formed by joining three continuous webs 19 along
their longitudinal edges 21 by adjoining, preferably by welding,
the inner walls of said webs. Thereby, two longitudinal stiffeners
3 are formed. The stiffeners 3 are formed before wrapping.
Referring to FIG. 6c a third embodiment is disclosed in which a
continuous web 19 is provided with stiffening narrow strips 22, one
for each stiffener 3 to be formed, in the longitudinal direction of
the web. The strips 22 are preferably attached along one of their
longitudinal edge portions 23 by a stitch weld or a roller seam
weld.
When wrapping the material, the stiffeners of the three embodiments
will extend in an outward direction on the outer face forming two
generally flat surfaces extending in the longitudinal
direction.
It is to be understood that the stiffeners 3 can be made in a
numerous ways, all falling within the scope of the invention.
It is also to be understood that the number of stiffeners and webs
joined depends on the desired shape of the package and the desired
number of stiffeners. By way of example, a package having a
prismatic transversal cross section can be made by forming one
longitudinal stiffener for each corner of the prismatic cross
section. Thus, each stiffener define an inner corner of the
package.
The stiffeners can be formed as a step in a continuous process of
manufacturing packages or as a separate operation for preparing
rolls of material for later processing.
The indication is preferably formed and covered by a label after
forming the stiffeners, but before wrapping the material to form a
package.
The indication is preferably formed by punching an indication in
the web of material. The indication may be a continuous through
slit, a perforation or an indentation. The form of the indication
will be dependent on, for example, the design and the size of the
flap, the step of the manufacturing process in which the indication
is formed as well as the packaging material.
After forming the indication, the indication is covered by applying
a label covering not only the extension of the indication, but also
an area surrounding the indication. For provision of a tight seal
the label should be applied covering not only the full extent of
the indication but also the tearing line that is formed when
opening the package. It is to be understood that the label also can
be applied over a limited extent of said indication. The label is
also applied to cover a portion of the stiffeners. Thereby the
package can be fully resealed although an opening is formed across
the full width, length or full front wall surface.
In the simplest form the transverse joints 5, 6 are formed by
arranging a welding nip in the transverse direction across the
wrapped material. Such transverse joint 5, 6 is schematically
illustrated in FIG. 7a. In case the front wall and back wall have
different trans-verse distances between the inner borderlines of
the stiffeners, i.e. the front wall is wider than the back wall, it
is preferred that a tool acting in the trans-verse direction is
used before welding for forming a longitudinal `soft` fold in the
widest wall, i.e. preferably the back wall. Such fold should be
provided at least in the region close to the transversal joint.
This fold will provide for the transversal joints to receive a
width essentially corresponding to the total width of the front
wall and the two longitudinal stiffeners. This will result in a
transversal joint 5, 6 having one central portion, having twice the
thickness of the sheet material and two edge portions, one on each
side of the central portion, having a thickness equal to four times
the thickness of the sheet material, see FIG. 7b.
However, depending on the design of the welding nip, the transverse
joint 5, 6 can also be formed as is disclosed in FIG. 7c. A central
portion 24 is formed having a thickness twice the thickness of the
material. Two edge portions 25, one on each side of the central
portion, are formed as two flanks 26, each having a thickness twice
the thickness of the edge portion. Thus, each end portion 25
together with the central portion 24 form a cross section in the
form of letter Y.
It is to be understood that the thickness of any welded or
otherwise formed joint, i.e. the longitudinal joint, the transverse
joints and the longitudinal stiffeners in practice will have a
thickness slightly smaller than the sum of layers of material in
the joint due to a thickness reduction occurring during
welding.
The method of forming the package is depicted in the flow chart of
FIG. 8. Although the package generally has been disclosed as being
made by wrapping a continuous material along its longitudinal
edges, it should be understood that a package within the scope of
protection also can be formed by putting together, either two
continuous webs of packaging material or two sheets, on top of each
other and then delimiting a pocket by forming a circumferential
joint. Before the webs or sheets are put together, at least one of
them are being provided with longitudinal stiffeners, an indication
and a label.
Generally in the description the longitudinal joint has been
disclosed and discussed as a joint being different from the
longitudinal stiffeners. In one possible embodiment, not disclosed,
the longitudinal joint can constitute one of the at least two
longitudinal stiffeners. In that case, said longitudinal joint
should preferably not be arranged on the back wall, but should
instead together with the inner borderline of the longitudinal
stiffener delimit a back wall and a front wall.
The longitudinal stiffeners, the longitudinal joint and the
transversal joints can be made more rigid by embossing or twice
folding.
It is to be understood that although the invention has been
disclosed with longitudinal stiffeners extending along the full
length of the container, the longitudinal stiffeners may have an
intermittent extension.
Although not illustrated, the label is preferably provided with
some sort of guarantee seal.
The invention has been illustrated as having an indication that
provides for an opening at one portion of the package allowing the
contents to be pulled out generally in the longitudinal direction.
It is to be understood that the invention also allows for an
opening that covers essentially the full front wall area of the
package, i.e. the area defined by the inner borderlines of the
longitudinal stiffeners and the transversal joints. This is very
useful if full access to the contents is desired from a direction
perpendicular to the longitudinal direction. By way of example such
package is very useful for hard cheese, whereby the cheese may be
sliced in the horizontal direction by using a cheese slicer while
still being positioned in the package. When finished, the package
can be resealed by pressing the label against the stiffeners.
It will be appreciated that the present invention is not limited to
the shown and described embodiment of the invention. Several
modifications and variants are thus conceivable, and consequently
the invention is defined exclusively by the appended claims.
* * * * *